What is t equal to in the equation 6t-1/6=9

The quadratic function h(t) = -16.1t^2 + 150 models a balls height, in feet, over time, in seconds, after its dropped from a 15 story building. from what height in feet was the ball dropped?

Does anyone know how to do geometryme with this problem

Which expression is equivalent to -12(3x-3/4)